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Angles on a Straight Line is a free printable Grade 4 maths worksheet on angles summing to one hundred and eighty, aligned to Common Core standard 4.MD.C.5. It prints 12 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 8 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Angles on a Straight Line

4.MD.C.5

NameDate

Work out each answer.

1.Two angles make a straight line. One is 126°. The other is ___
2.Two angles make a straight line. One is 89°. The other is ___
3.Two angles make a straight line. One is 157°. The other is ___
4.Two angles make a straight line. One is 25°. The other is ___
5.Two angles make a straight line. One is 106°. The other is ___
6.Two angles make a straight line. One is 148°. The other is ___
7.Two angles make a straight line. One is 31°. The other is ___
8.Two angles make a straight line. One is 51°. The other is ___
9.Two angles make a straight line. One is 136°. The other is ___
10.Two angles make a straight line. One is 108°. The other is ___
11.Two angles make a straight line. One is 139°. The other is ___
12.Two angles make a straight line. One is 48°. The other is ___

LessonPrint · 4.MD.C.5 · Set 8 · free to copy for classroom use

Answer key — Angles on a Straight Line

Set 8. Prints on its own sheet.

  1. 1.54°
  2. 2.91°
  3. 3.23°
  4. 4.155°
  5. 5.74°
  6. 6.32°
  7. 7.149°
  8. 8.129°
  9. 9.44°
  10. 10.72°
  11. 11.41°
  12. 12.132°

Last reviewed 2026-09-05. Aligned to 4.MD.C.5 of the Common Core State Standards for mathematics.